Leakage rate‐based untrustworthy relay selection with imperfect channel state information: the outage and security trade‐off analysis
Volkan Özduran · IET Communications · 2019
This study investigates the effects of the imperfect channel state information on the leakage rate‐based untrustworthy relay selection strategies. The investigation considers that the channel state information is imperfect because of the channel estimation errors and also the feedback delay with time‐variant channels. The investigation also considers three different types of leakage rate‐based selection strategies, which are half‐duplex, full‐duplex, and hybrid. The investigation also considers a dual‐hop one/two‐way amplify‐and‐forward‐based half‐/full‐duplex wireless relaying network in the system model. In addition, in order to mitigate the information leakage, a finite number of friendly jammers are affecting the untrustworthy relay terminals. According to analytical, asymptotic, and Monte–Carlo simulation results, the leakage rate‐based selection strategies achieve cooperative diversity order in high signal‐to‐noise ratio regimes. The channel estimation error causes system coding gain losses in low signal‐to‐noise ratio regimes. The feedback delay degrades the achievable diversity order from M to 0 and also causes system coding gain losses in high signal‐to‐noise ratio regimes. In addition, the friendly jammers and loop‐interference also degrade the achievable diversity order and also cause system coding gain losses in high signal‐to‐noise ratio regimes.